You may choose to protect VMware vCenter Server using third-party clustering solutions including, but not limited to, MSCS (Microsoft Cluster Services) and VCS (Veritas Cluster Services). VMware does not certify these third-party solutions. VMware will offer best effort support for any issues encountered with an environment that uses third-party solutions for protecting against VMware VirtualCenter downtime. However, if your issue is determined to be related to the third-party clustering solution, VMware will refer to our third-party software policy